Re: [PATCH] sched/fair: Replace random newidle_balance with Bresenham accumulator

[Qing Wang <wangqing7171@gmail.com>]

On Wed, 13 May 2026 at 13:29, K Prateek Nayak <kprateek.nayak@amd.com> wrote:
> I took the most sensitive workload I have for newidle balance (tbench)
> and took it for a spin with these changes. Following are the results:
> 
>     Clients:        tip                  bresenham_accm
>         1      321.65 (0.00 pct)       313.97 (-2.38 pct)
>         2      641.92 (0.00 pct)       638.74 (-0.49 pct)
>         4     1245.65 (0.00 pct)      1237.26 (-0.67 pct)
>         8     2435.80 (0.00 pct)      2442.23 ( 0.26 pct)
>        16     4717.66 (0.00 pct)      4688.19 (-0.62 pct)
>        32     9303.53 (0.00 pct)      9390.71 ( 0.93 pct)
>        64    18002.57 (0.00 pct)     17911.56 (-0.50 pct)
>       128    27729.26 (0.00 pct)     27621.95 (-0.38 pct)
>       256    47134.77 (0.00 pct)     46137.36 (-2.11 pct)
>       512    43179.41 (0.00 pct)     43277.53 ( 0.22 pct)
>      1024    40339.30 (0.00 pct)     40176.49 (-0.40 pct)
> 
> The %diff is in noise range which is a good indication that there
> shouldn't be any surprises. I'll queue a run overnight to see if
> there are other benchmarks that like / dislike these changes.
> 
> I'll let Peter comment on the change itself since he knows these
> bits best ;-)

Oh! Thanks for your benchmarks :) The %diff looks good.
Let's wait for Peter's comments.

--
Best regards,
Qing